甘肃黄土高原地区春旱指标研究  

The Dry Indexes of Spring Drought of the Loess Plateau in Gansu Province

作　　者：李富洲[1] 陈少勇[2] 林纾[1] 

机构地区：[1]兰州中心气象台,兰州730020 [2]白银市气象局,白银730900

出　　处：《干旱区资源与环境》2007年第9期89-92,共4页Journal of Arid Land Resources and Environment

基　　金：兰州区域气象中心开放实验室"干旱气象监测试验研究"课题资助

摘　　要：利用甘肃省甘肃黄土高原地区12个代表站1958—2003年春季3～5月逐候降水、蒸发资料，建立了该地区早春旱和晚春旱指数序列，确定了春旱等级标准，进一步分析了春旱的时空分布特征及其年际（年代际）变化规律。结果表明：（1）干旱指数能够连续动态地监测干旱过程，因而具有较好的代表性；（2）甘肃黄土高原地区早春旱和晚春旱北部高于南部，干旱中心在陇中；（3）重晚（早）春旱的发生频率增加（减少），站数增多（减少）；（4）区域性早春旱随年代呈下降趋势，区域性晚春早略有上升的趋势，但不明显。The precipitation and evaporation data at 12 observational stations from 1958 to 2003 were used to calculate the spring drought index, the criterion of spring drought and the spring drought index series were set up, the spatial and temporal features, yearly and decadal climate variability of the indexes of the Loess Plateau in Gansu Province were analyzed. The results showed the drought index could successively and dynamically monitor the drought process, so it was the better representative;the frequency of spring drought of the Loess Plateau area in Gansu was stronger in north than in south and its center is in Gansu center;The frequency of serious late spring drought was increasing while that of early spring drought was decreasing.

关 键 词：春旱 干旱指数 气候变化 

分 类 号：P426.616[天文地球—大气科学及气象学]